Method of securing resilient material covers to a roll



W. L. GLASS June 8, 1965 METHOD OF SECURING RESILIENT MATERIAL COVERS TOA ROLL Filed May '7, 1963 INVENTOR Ma. lass United States Patent()3,187,409 METHOD OF SECURING RESILIENT MATERIAL COVERS T A ROLL WalterL. Glass, Claverack, N .Y. Ames American Co., Box 606, Columbus, Miss.)Filed May 7, 1963, Ser. No. 278,643 Claims. (Cl. 29--148.4)

This invention relates to a method of securing covers on articles, andmore particularly to a method of rigidly securing a cover of resilientmaterial on a rigid core member. Y

In many industries, including the paper, textile and steel industries,where the material produced or processed is in a continuous web form,such material usually is guided, conveyed or fed by means of cylindricalmetal rolls. Often such rolls are provided with a rubber sleeve or covermounted on the outside cylindrical surface of a core member which isjournaled in suitable support means.

' In the prior art there are many types of rolls having covers ofresilient material which utilize various methods for attaching the covermaterial to the cylindrical surface of' the core member. Generally, theresilient material, usually rubber, is attached to the metal core memberby bonding, molding, with the use of threaded fasteners or rivets or,most commonly, by merely relying upon the shrinking action of theresilient material which provides the most economical method ofattaching. However, in vthe use of such latter method of attaching, itlhas been found that such covers are apt to slip relative to the coremembers on which they are mounted, when the web material, is fed at highspeeds. This occurrence is particularly troublesome in rubber coveredvacuum rolls generally comprising a cylindrical Vmetal core memberhaving an axial bore and a plurality of radial openings com-'rnunicating with the bore, and a rubber cover mounted onthe outsidecylindrical surface of the core member, having a plurality of openingsin registry With the Vopenings in the core member. The axial bore of thecore member is usually closed at one end and the opposite end thereof isconnected to a suitable suction source such as a vacuum pump. Undernormal operating conditions when suction is applied to the bore of theroll, the web material in contact with the roll is held firmly againstthe cylindrical surface thereof. It further has been found, however,that when the speed of the continuous web is increased to high speeds,the rubber cover often slips, causing the registered suction aperturesto move out of alignment, thereby either eliminating or decreasing theeffective gripping action of the roll.

It is, therefore, the principal object of this inventionto provide' animproved method of securing a cover of resilient material on an article.

Another object of this invention is tov provide an improved method ofrigidly securing a cover of resilient material on the core member of aroll.

Another object of this invention is to provide an improvedv method ofattaching a cover of resilient material on the core member of a roll.

A further object'of this invention is to provide an inexpensive andsimple method of attaching a'cover of resilient material on the coremember of a roll.

Further objects and advantages of the present inventionwillbecomeapparent as the following description proceeds, when taken inconjunction with the drawings which accompany and form a part of thespecification wherein:

FIGURE 1 is a top planview of a preferredl embodiment of the presentinvention,having portion thereof broken away; y FIGURE 2 is across-sectional view taken along line 2-2 of FIGURE l; and

Patented June 8, 1965 lCC FIGURE 3 is a cross-sectional View taken alongline 3 3 in FIGURE 2.

In accordance with Vthe broad aspects of the present invention, there isprovided a roll suitable for use With continuous web material generallycomprising a core member having a cover of resilient material mountedthereon in gripping relation.V The covered surface of the core member isprovided with at least one recess beneath the cover defining a chamberhaving a pressure less than the pressure on the outside surface of thecover, whereby the differential pressure across that portion of thecover overlying the recess causes such portion to be drawn into therecess to rigidly secure the cover to the core member. Broadly, thenovel method of attaching the cover to the core member consists offorming the recess in the surface of the core member to be covered,heating the core member to expand the gases in the recess, mounting thecover on the core member in overlying relation with the recess so thatwhen the core member cools, the gases in the chamber defined by therecess and the portion of the cover overlying the recess, contract toprovide a partial vacuum. With the contraction of the gases in suchchamber, the portion of the cover overlying the recess is drawn into therecess, thereby providing a vacuum lock to rigidly secure the cover tothe core member.

Referring to the drawings, there is shown a preferred embodiment of theinvention, including a cylindrical metal core member 10 having an axialbore 11 anda sleeve or cylindrical cover member 12 of a resilientmaterial, preferably rubber, mounted on the outside cylindrical surfaceof the core member. The inside diameter of the cover member is slightlyless than the outside diameter of the core member, so that when thecover member is mounted on the core member, it will grip the core memberto prevent relative slippage between the cover and the core member as isconventional practice in the art. The core member is provided with aplurality of radially extending through passageways 13, communicatingwith the axial bore of the core member and the exterior thereof. Thethrough passageways 13 preferablyrare circumferentially and axiallyspaced to Vprovide a uniform distribution thereof on the cylindricalsurface 14 of the core member. Also provided on the cylindrical coveredsurface 14 and interspersed betweenthe through passageways 13 is aplurality of radiallyV disposed drilled openings 15 having closedbottoms. The pressure in the drilled openings 15 is less than thepressure on the cover member, so that those portions 16 of the covermember overlying the drilled openings 15 are Vdrawn into the openings,thereby providinga'vacuum lock for the cover member. As best shown inFIGURES 2 and 3, the cover 12 is provided with a plurality of openings17, arranged so as to register with the through openings 13 to formsuction apertures. i

The ends of the core member 10 are providedV with closure members 18 and19 mounted on suitable journals 20 and 21, respectively. The endjournal20 is provided with an axial bore 21 communicating with the axialbore Y in the core member and adapted to be connected to a vacuum sourcesuch as a suction pump.

The roll, as illustrated in the drawings, is made by firstk forming thethrough passageways in a piece of suitable tubular bar stock having asubstantiallyV thick wall to provide the core member. The openings 15are then drilled in the outside kcylindrical surface of the core memberinterspersed between the through openings 13. The core member is thenheated to a temperature sufficient to cause the gases in the drilledopenings 15 to expand, yet insuflicient to alter significantly thechemical or physical properties of the cover member 1,3` to be mountedthereon. VWhen the core member is formed of bronze and the cover ofrubber, a temperature of 300 F. has been found suitable for thispurpose. While the cover member is still heated and the gases in theopenings 15 are expanded, the cover member 12 is then mounted on thecore member so that the through openings 17 therein are in registry withthe through openings 13 of the core member. The core member is thenpermitted to cool, whereby the contracting gascs in the drilled openings15 cause those portions of the cover overlying such openings to be drawntherein, as best shown in FIGURE 3, to provide a vacuum lock, thusrigidly securing the cover to the core member.

During operation of the roll at high speeds, the cover member will berigidly secured to the core member, whereby the through openings 13 inthe core member and the through openings 17 in the cover will remain inregistry, thus permitting the maximum amount of suction to be applied tothe continuous web material in contact with the outside surface of thecover member. It will be appreciated that relative movement between thecover and the core member is prevented by means of the combined actionof the inherent gripping action of the cover, the vacuum lock providedby the partial vacuums created in the drilled openings 15, and thoseportions 16 of the cover member extending partly into the drilledopenings.

From the foregoing detailed description, it will be evident that thereare a number of changes, adaptations and modications of the presentinvention which come within the province of those skilled in the art.However, it is intended that all such variations not departing from thespirit of the invention be considered as within the scope thereof aslimited solely by the appended claims.

What I claim is:

1. A method of attaching a cover of resilient material on the coremember of a roll comprising forming at least one recess in said coremember, heating said core member to temperature suicient to expand thegases in said recess, mounting said cover on said core member inoverlying relation with said recess while said roll is yheated andcooling said core mem-ber whereby at least a partial vacuum is providedin the closed chamber defined by said recess and the portion of saidcover overlying said recess to vacuum lock said cover to said coremember.

2. A method of attaching a cover of resilient material on a cylindricalmetal core member of a roll comprising forming a plurality of recesseson the outside cylindrical surface of said core member, heating saidcore member to a temperature sufficient to expand the gases in saidrecesses yet insufficient to alter the chemical or physical propertiesof said cover material, mounting said cover on said heated core memberin overlying relation with said recesses and cooling said core memberwhereby the contracting gases within the closed chambers defined by saidrecesses and those cover portions overlying said recesses provide atleast a partial vacuum therein so that said overlying cover portions aredrawn into said recesses thereby locking said cover to said core member.

3. A method of attaching a rubber cover on a cylindrical bronze coremember of a roll comprising drilling a plurality of holes having closedbottoms in the outside cylindrical surface of said core member, heatingthe core member to about 300 F. to expand the gases in said recesses,mounting said cover on said heated core member so that portions of saidcover overlie said holes and cooling said core member whereby thecontracting gases within the closed chambers defined by said holes andsaid overlying cover portions produce at least a partial vacuum thereinso that said overlying cover portions are drawn into said holes therebylocking said cover to said core member.

4. A method of attaching a cover of resilient material on a cylindricalmetal core member of a roll having an axial bore and a plurality ofradial openings in the outside cylindrical surface thereof communicatingwith said bore, wherein said cover is provided with a plurality ofopenings adapted to register with said openings in said core member whenthe cover is mounted on said core member comprising forming a pluralityof recesses on the outside cylindrical surface of said core member,interspersed between said through openings in said core member, heatingsaid core member to a temperature suiiicient to expand the gases in saidrecesses yet insuicient to alter the chemical or physical properties ofsaid cover material, mounting said cover on said heated core member sothat the openings in said cover register with the through openings insaid core member and portions of said cover overlie said recesses andcooling said core member whereby the contracting gases within the closedchambers defined by said recesses and said overlying cover portionsproduce at least a partial vacuum therein so that said overlying coverportions are drawn into said recesses thereby locking said cover to saidcore member.

5. A method of attaching a rubber cover on a cylindrical bronze coremember of a roll having an axial bore and a plurality of radial openingsin the outside cylindrical surface thereof communicating with said bore,wherein said cover is provided with a plurality of openings adapted toregister with said openings in said core member when said cover ismounted on said core member comprising drilling a plurality of radialextending holes having closed bottoms in the outside cylindrical surfaceof said core member interspersed between said through openings in saidcore member, heating said core member to about 300 F. to expand thegases in said holes, mounting said cover on said heated core member sothat the openings in said cover register with the through openings insaid core member and portions of said cover overlie said radial holesand cooling said core member whereby the contracting gases within theclosed chambers defined by said said radial holes and said overlyingcover porf tions produce at least a partial vacuum therein so that saidoverlying cover portions are drawn into said radial holes therebylocking said cover to said core member.

References Cited by the Examiner UNITED STATES PATENTS 2,292,851 8/42Tykal 226-191 2,293,794- 8/42 Bell et al 29-148.4 2,450,727 10/48Haushalter 29-148.4 2,566,439 9/51 Wieman 29-121 2,804,300 8/57 Bilane226-191 3,035,331 5/62 VVieman 29-l48.4 X

WHITMORE A-. WILTZ, Primary Examiner.

RAPHAEL M. LUPO, THOMAS H. EAGER,

, Examiners.

1. A METHOD OF ATTACHING A COVER OF RESILIENT MATERIAL ON THE COREMEMBER OF A ROLL COMPRISING FORMING AT LEAST ONE RECESS IN SAID COREMEMBER, HEATING SAID CORE MEMBER TO TEMPERATURE SUFFICIENT TO EXPAND THEGASES IN SAID RECESS, MOUNTING SAID COVER ON SAID CORE MEMBER INOVERLYING RELATION WITH SAID RECESS WHILE SAID ROLL IS HEATED ANDCOOLING SAID CORE MEMBER WHEREBY AT LEAST A PARTIAL VACUUM IS PROVIDEDIN THE CLOSED CHAMBER DEFINED BY SAID RECESS AND THE PORTION OF SAIDCOVER OVERLYING SAID RECESS TO VACUUM LOCK SAID COVER TO SAID COREMEMBER.